The Midisport Uno is of no use in this situation, as no audio is transmitted over MIDI.

If your vetta has the Digital Interface Card installed, you can get digital out through the S/PDIF output.  See the manual, page 3.11. 

Otherwise you can run the direct outs into a recording interface to convert the analog audio to digital.

See this thread:

http://line6.com/support/message/67953#67953

Good Luck,

Joe